[C++11] Replace llvm::next and llvm::prior with std::next and std::prev.

Remove the old functions.

llvm-svn: 202636
diff --git a/llvm/lib/Transforms/Utils/CodeExtractor.cpp b/llvm/lib/Transforms/Utils/CodeExtractor.cpp
index 41ced40..c96c030 100644
--- a/llvm/lib/Transforms/Utils/CodeExtractor.cpp
+++ b/llvm/lib/Transforms/Utils/CodeExtractor.cpp
@@ -86,7 +86,7 @@
   }
 
 #ifndef NDEBUG
-  for (SetVector<BasicBlock *>::iterator I = llvm::next(Result.begin()),
+  for (SetVector<BasicBlock *>::iterator I = std::next(Result.begin()),
                                          E = Result.end();
        I != E; ++I)
     for (pred_iterator PI = pred_begin(*I), PE = pred_end(*I);